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(No Model.) H. G. HAPPOLD.

- SCREW PROPELLER. No. 507,320. Patented 0011.; 2.4, 1893.

- fill P166 01:

Whzasses: 6'. fi a wza m UNITED STATES PATENT OFFICE.

HENRY c. HAPPOLD, OF NEW- YORK, N. Y.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 507,320, dated October24, 1893.

Serial No. 476,078- (No model.)

To all whom it may concern:

Be it known that I, HENRY O. HAPPOLD, of New York city, New York, haveinvented an Improved Screw-Propeller, of which the following is aspecification.

This invention relates to a screw propeller more particularly designedto be used on twin screw steamers and having a boss or hub that taperstoward both ends.

In the accompanying drawings: Figure 1 is I a side elevation of myimproved screw propeller; Fig. 2 a top view partly in section of a hullprovided with twin screws constructed according to my invention.

The letter a, represents the hull of a vessel to which the propeller isattached.

The propeller is formed of a hub orboss b, that is widest at or near thecenter and tapers toward both ends. To the center or widest part b, ofthe boss the blades 0, are attached. The rear end of the propeller shaft(1, is supported by a bracket e, secured to the keel a,

at the top and bottom and provided at the center with a conical tip orpointed bearing 6, in which the shaft (1, revolves. This tip forms ineffect the apex of a cone of which the boss 19 is the body and thus thewater divided by the propeller will close behind the point of the tip,so that no suction is created. It will be seen that the boss I),projectsaconsiderable distance to the front and rear of the blades andthat by being supported at its rear end, it will not be apt to becomedislodged. As the boss is thickened where it carries the blades, thelatter may be made of reduced length and may be widened at their outerend as at c, to increase their efticiency. My improved propeller willdivide the water readily will not create back suction and will be firmlysupported in all its parts.

What I claim is- The combination of a propeller composed of a taperingboss and blades secured thereto, with a bracket attached to the hull inthe rear of the boss and with a tip that tapers from front to rear andsupports the rear end of the propeller shaft, substantially asspecified.

HENRY O. HAPPOLD.

Witnesses:

F. v. BEIEsEN, 7 WM. SoHULz.

